Statistical utilities

I have worked a lot with on random inequalities, and Inequality Calculator often comes in handy. Parameter Solver is also popular, used for determining distribution parameters based on quantiles or mean and variance.

Avoiding Overflow, Underflow, and Loss of Precision explains why the most obvious method for evaluating mathematical functions may not work. The article includes C++ source code for evaluating some functions that come up in statistics (particularly logistic regression) that could have problems if naïvely implemented.

PowerShell

PowerShell is a new shell for Windows. After decades of having a wimpy command line compared to Unix, Microsoft produced a shell more powerful than its Unix counterparts. The biggest difference is that while Unix shells pipe text, PowerShell pipes objects.

PowerShell gotchas lists the top five features a new users might find frustrating and gives a justification for each.